JP3251881B2 - Liquid storage container, ink jet cartridge including the liquid storage container, and ink jet recording apparatus including the ink jet cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid storage container for storing a liquid, which is applied to, for example, an ink jet recording apparatus, and more particularly to a liquid using a negative pressure to supply the liquid stored therein to the outside. It relates to a storage container.

[0002]

2. Description of the Related Art Conventionally, as a container for accommodating a liquid, a container for supplying a liquid while applying a negative pressure to the inside of the container when supplying the liquid to the outside has been known. A feature of this type of container is that a proper liquid supply can be performed to a liquid using part connected to the container by the negative pressure given by the container itself.

There are various types of such a theory that have been demonstrated in actual liquid storage containers, but the range of use of the various containers has been limited. This is because there is no manufacturing variation and there is no simple structure.

[0004] For example, in the field of ink jet recording which needs this negative pressure characteristic properly, there is a method in which a sponge as a negative pressure source is stored in an ink tank as a liquid storage container, or a bag of ink. Provide a spring in the storage section,
A device that forms a negative pressure by giving a force against inward deformation of a bag due to consumption of ink (Japanese Patent Application Laid-Open No. 56-67269).
And Japanese Patent Application Laid-Open No. 6-226993). The rubber ink container disclosed in U.S. Pat. No. 4,509,062 has a conical shape in which a conical portion is rounded, and the rounded conical portion has a conical peripheral surface. This is a configuration in which the thickness is made smaller than the thickness. The thin rubber bag structure with the rounded conical portion is a structure for the storage container to be preferentially displaced and deformed in accordance with ink consumption. These have been put to practical use as ink containers for ink jet devices, and are satisfactory at present.

However, since such a negative pressure generating structure is relatively expensive, it is not suitable for a writing implement having a pen tip such as a marker or a plotter. In particular, it is not preferable to have an extra complicated negative pressure generating structure as described above as a writing implement of this kind, because the writing implement itself becomes large in size.

[0006] Incidentally, the above-mentioned writing implement employs a form in which ink is supplied while air is introduced into the liquid storage container from the pen tip by using a felt capable of generating a negative pressure at the pen tip itself. ing. The biggest problem with the gas-liquid exchange structure in this ink supply mode is ink leakage from the pen tip. In order to solve this problem, as a mechanism for preventing ink leakage between the pen tip and the liquid storage container, many fins are stacked at a predetermined interval so as to intersect the ink supply direction, so that leakage occurs due to environmental changes etc. It has been proposed to provide an ink holding mechanism capable of holding the ink to be made. However, at present, this mechanism leaves unusable ink inside the writing implement.

Further, the ink supply system of this type of writing implement is generally open to the atmosphere, which causes the stored ink to evaporate and reduce the amount of ink used. It is preferable to perform ink evaporation suppression as a typical closed type.

Here, the field of ink jet recording using a substantially closed type will be briefly summarized. Generally, when a negative pressure source is not used as the ink supply system,
2. Description of the Related Art There is known an ink supply unit that supplies ink by a difference in elevation with respect to an ink using unit (ink ejection head) called a “head difference”. In this case, since no special conditions are required for the ink storage unit, an ink storage bag such as a normal bag is often used.

However, since the ink supply path is of a sealed type, a supply pipe such as a tube is required from the ink storage bag to an ink use section (ink discharge head) located above, resulting in a large-sized apparatus. Would. In order to minimize or eliminate the head difference in the ink supply path, an ink tank for applying a negative pressure to the ink ejection head has been proposed and implemented. The one in which the head and the ink tank can be integrated will be referred to as an ink jet cartridge.

The ink-jet cartridge is further classified into a structure in which a recording head and an ink container are always integrated, a structure in which a recording unit and an ink container are separate, and both can be separated from a recording apparatus. It can be divided into a configuration to be used integrally.

In any of the configurations, in order to increase the efficiency of use of the ink stored in the ink storage section, the coupling section of the ink storage section with the recording means is often provided below the center of the ink storage section. For this reason, in order to stably hold the ink in the ink storage section of the ink jet cartridge and to prevent ink leakage from a discharge section such as a nozzle provided in the recording section, the back pressure against the ink flow supplied to the recording section is reduced. Is required. This back pressure is called negative pressure because the pressure at the discharge port is made negative with respect to the atmospheric pressure.

One of the easiest methods for generating a negative pressure is a method utilizing the capillary force of a porous body as described above. The ink tank in the method is
Stored inside the ink tank for the purpose of storing ink,
Preferably, the ink jet recording apparatus includes a compressed and stored porous body such as a sponge, and an air communication port through which air can be introduced into the ink storage section to smoothly supply ink during printing.

However, a problem when using a porous member as an ink holding member is that the ink storage efficiency per unit volume is low. In order to solve this problem, a configuration in which a porous body is inserted into a part of the ink tank is used instead of the configuration in which the porous member is inserted into the entire ink tank. With this configuration, the ink storage efficiency per unit volume and the ink holding capacity can be increased as compared with the configuration in which the porous body is inserted into the entire ink tank.

From the viewpoint of further improving the ink storage efficiency, a bag-like container having a combination of a bag and a spring as described above, or a rubber ink container can be used. As described above, the ink jet recording apparatus having the liquid storage container has been described in detail, but the liquid storage container as described above is used in other fields.

[0015]

With the current ink tanks as described above, the demands of the current market are at a satisfactory level.

However, the present inventors have come up with the following problems when considering the ideal conditions required for the liquid container from the perspective of the future prospects.

The first point is that the liquid storage efficiency is further improved (first problem). That is, by further increasing the liquid storage efficiency of the liquid storage container occupying the same space, the liquid storage amount of the liquid storage container is increased.

The second point is that the number of component parts is small, the structure of the parts themselves is simple (second problem), and as additional effects, there are advantages such as a reduction in product yield and a reduction in quality control items. Can be expected.

More preferably, it is a measure to cope with an environmental problem which has recently become a problem. One of the countermeasures is
The component of the liquid container is recyclable. For that purpose, it is desirable that the liquid storage container has as few components as possible and that the components can be easily separated and collected when collecting the components.

However, the liquid storage container storing the porous member is not sufficiently satisfactory in liquid storage efficiency as described above. Also, even with the current configuration using a bag-shaped container, those having a complicated mechanism such as a spring inside the liquid storage unit or between the liquid storage unit and the housing use a complicated mechanism, The number of parts is large and assembly is complicated.

In addition, the above-mentioned conical rubber liquid container is limited in structure as described above, so that a maximum space cannot be provided in a desired space. In addition, the type of liquid that can be used is restricted from a material viewpoint. Therefore, this conical rubber liquid storage bag has a complicated structure and manufacturing conditions, and is complicated in terms of quality control.
Product yield is not good.

Based on the knowledge obtained by the research by a part of the present inventors and a comprehensive viewpoint, the present applicant has set a typical liquid storage container that solves the above-mentioned problem as the same as the inner surface of the housing. Alternatively, an application for a liquid container having a flexible liquid storage portion having a similar outer surface has already been filed, but the present invention was conceived as a result of intensive studies by the present inventors.

That is, the above-described liquid storage container generates a negative pressure by deforming a surface having a maximum area among the wall surfaces constituting the liquid storage portion as the liquid is used. Focusing on the surface having the maximum area of the storage section, when the volume of the liquid storage container increases, the deformation on the surface having the maximum area varies, and the supply of liquid to the outside becomes unstable. At the same time, attention has been paid to the fact that the surface having the maximum area is easily deformed and the strength against an external impact such as a drop may be reduced.

The present invention is particularly suitable for a large-sized liquid storage container, and can be applied to an ink tank in the field of ordinary ink-jet recording. It is an object of the present invention to provide a liquid container that is extremely small and strong in strength.

[0025]

According to the present invention constructed as described above, a substantially polygonal column-shaped housing having an air communication portion and an outer surface having a shape similar to or similar to the inner surface of the housing are provided. and the inclusion bodies peelable with said housing to form a liquid containing portion for accommodating liquid therein, a liquid supply portion for supplying liquid to the outside from the liquid containing portion, wherein
The walls forming the inclusion body are on the wall forming the housing.
A liquid container having a pinch-off portion sandwiched and welded , wherein the pinch-off portion is formed by two opposing surfaces having a maximum area of the inner package.
It is characterized by having.

Further, the pinch-off portion is provided substantially at the center of the surface having the maximum area.

Further, a plurality of the pinch-off portions are provided.

Further, the liquid storage portion is substantially donut-shaped.

Further, the pinch-off portion also serves as an air communication port.

The intersection between the corner and the surface and the intersection between the surfaces formed by the three extended portions of the substantially polygonal prisms of the casing and the inner package are minute curved surfaces, respectively. It is characterized by.

Further, a substantially polygonal column-shaped housing having an air communication portion , an outer surface having a shape similar to or similar to the inner surface of the housing, and a liquid storage portion for storing liquid therein are formed. the housing and the peelable inclusion body, a liquid supply portion for supplying liquid to the outside from the liquid containing portion, wherein
The walls forming the inclusion body are on the wall forming the housing.
A liquid container having a pinch-off portion sandwiched and welded , wherein a through hole is provided in a surface having a maximum area of the housing and the inner package.

Further, the through hole is provided substantially at the center of the surface having the maximum area.

Further, a plurality of the pinch-off portions are provided.

Further, the liquid storage portion is substantially donut-shaped.

Further, the pinch-off portion is provided in the through hole. Further, the pinch-off portion also serves as an air communication port.

The intersection between the corner and the surface, and the intersection between the surface and the surface formed by the three extended portions of the substantially polygonal prisms of the housing and the inner package are minute curved surfaces, respectively. It is characterized by.

Further, the liquid is a seasoning for food.

A liquid storage container and an ink jet head connected to the liquid supply unit for discharging the liquid in response to a recording signal, wherein the liquid is discharged to a recording medium; The recording is performed by using an ink.

Further, the present invention is characterized in that it has the ink jet cartridge and a carriage on which the ink jet head cartridge is detachably mounted and which is scanned.

(Function) In the present invention configured as described above, at the center or at a plurality of positions of the surface of the liquid container having the maximum area, the opposing inner walls are pressure-bonded so as to be sandwiched by the outer walls. Therefore, even when the container is enlarged, the strength against external impact does not weaken, and the inside of the container is divided into a plurality of storage portions, so that a stable negative pressure is generated. Thus, a stable supply of liquid is performed.

Further, since the through hole having the pinch-off portion is provided at the center or at a plurality of positions of the surface of the liquid container having the maximum area, even if the container becomes large, it can be protected from external impact. The strength is not weakened, and the inside of the container is divided into a plurality of storage sections, and the atmosphere is introduced between the outer wall and the inner wall from around the through hole, so that a stable negative pressure is generated. Thereby, a stable supply of liquid is performed.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, preferred embodiments when the liquid container of the present invention is enlarged will be described as first and second embodiments.

FIG. 1 is a view showing a first embodiment of a liquid container according to the present invention, wherein (a) and (b) are sectional views, (c) is a perspective view, and (d) details of a pinch-off portion. FIG.
(A) is a cross-sectional view of a portion indicated by BB 'in (b), and (b) is a cross-sectional view of a portion indicated by AA' in (a).

In this embodiment, as shown in FIG. 1, an inner wall 70 which is an inner package forming a liquid storage portion for storing a liquid therein.
2 and the inner wall 7 having the same or similar shape as the inner wall 702
Outer wall 701 which is a housing formed so as to surround
And a liquid supply unit 703 for supplying the liquid stored inside the inner wall 702 to the outside. A through hole 710 is provided at the center of the surface of the liquid storage container having the maximum area. The inner wall 702
The outer wall 701 has a substantially donut shape. Also,
A pinch-off portion is formed on the outer periphery of the outer wall 701 on the side of the liquid supply unit 703, on the opposite side, and around the through hole 710. The thickness of the inner wall 702 and the outer wall 701 is such that the inner wall 702 is freely deformable, and the outer wall 701 is thicker than the inner wall 702 and hardly deformed. Further, the liquid storage unit is separated into a first storage unit 721 on the liquid supply unit 703 side and a second storage unit 722 on the opposite side with the through hole 710 therebetween.

Note that since FIG. 1 is a schematic diagram, the positional relationship between the outer wall 701 of the liquid container and the inner wall 702 of the liquid container is drawn as if they are separated from each other. The inner wall and the outer wall may be in contact with each other or may be configured to be arranged with a small space therebetween. Therefore, in any case, in the initial state of use, the liquid storage container follows at least the outer wall 701 along the shape of the inner surface of the outer wall 701.
Are formed so that the corners of the inner wall 702 come to the positions corresponding to the corners.

Here, the corner portion is a portion corresponding to an intersection where at least three surfaces intersect, more preferably three planes, or an extension of the plane in a liquid container composed of a substantially polyhedron. It is a meaning including.

In the liquid container of this embodiment, in the initial state, the corners of the inner wall correspond to the corners of the outer wall.
The inner wall of the liquid storage container has a similar shape to the outer wall 701 of the liquid storage container, and the inner wall 702 of the liquid storage container can be formed along the liquid storage container outer wall 701 serving as a housing at intervals within a predetermined range. That is, the dead space seen when the bag-shaped container is stored in the conventional housing can be eliminated, and the liquid storage amount per unit volume in the outer wall of the liquid storage container is increased (the liquid storage efficiency is increased). be able to.

Here, in the pinch-off section, FIG.
As shown in (d), the inner walls 702 are pressed together so as to be sandwiched between the outer walls 701.
1 is formed of a releasable material, so that the inner wall 702 and the outer wall 701 are also separated at the pinch-off portion, so that a gap 707 is formed between the outer wall 701 and the inner wall 702. Is formed.

In the gap 707 described above, the inner wall 70
Numeral 2 is an air intake for introducing air between the inner wall 702 and the outer wall 701 when the volume is reduced and deformed due to consumption of the ink inside, and also serves as an air communication portion. Note that the air communication portion is not limited to the case where the gap 707 in the pinch-off portion as shown in FIG. 1 is used, and may be formed by providing a simple opening in the outer wall 701.

When the above-mentioned gap 707 is provided, the gap 707 can be formed by peeling the inner wall 702 from the outer wall 701 by utilizing residual stress caused by forming the outer wall 701 and the inner wall 702 with different materials. In this case, a valve (not shown) that opens to the outside may be provided on the outer wall 701 to assist the pressure balance of the inner wall 702. This is because in a normal liquid supply, the outer wall 70
Although sufficient pressure adjustment is possible by drawing and introducing air into the space between the first and inner walls 702, it is because a rapid pressure change due to a drop or the like can be absorbed more quickly. .

The liquid supply unit 703 is connected to a member to which liquid is supplied from the liquid storage container.
A liquid lead-out permitting member 706 having a liquid leakage preventing function capable of preventing leakage of liquid from the liquid crystal 03 is provided. In the present embodiment, a unidirectional fiber member made of a liquid absorber is used, and a configuration having a meniscus holding force is provided. It has become. The ink outlet is substantially sealed by the liquid lead-out permitting member 706, and when the liquid inlet on the member side to which the liquid is supplied from the liquid container is inserted, the liquid in the liquid receiver is kept airtight. Derivation is possible.

Here, the pinch-off section will be described in detail.

The pinch-off portion is formed by sandwiching a parison for forming the wall of the liquid container with a mold during blow molding described later.
As shown in (d), the inner walls 702 are welded to each other,
Since it is in close contact with the outer wall 701 so as to be engaged therewith, it is also used as a support for supporting the inner wall 702 as described later. In this embodiment, as shown in FIG. 1C, the shape of the pinch-off portion is a straight line when viewed from the side,
In a manufacturing process described later, the liquid storage container need not be a simple linear shape as long as the liquid storage container can be easily extracted from the mold. Further, the length is not limited to the length presented in the present embodiment, and may be any length that does not protrude from the side.

In this embodiment, the pinch-off portion is formed over almost the entire width in the height direction of the liquid container as shown in the figure. In this case, in the manufacturing method described below,
Since the expansion of the parison can be reduced, the distance from the parison to the corner of the liquid container can be substantially reduced, and the thickness of each corner can be formed as equal as possible, and the strength of the corner can be improved. Can be made equal.

Further, by providing the pinch-off portion in substantially the entire width of the side surface of the container as in this embodiment, the supporting portion of the inner wall can be more stably maintained, and the generation of a negative pressure with respect to the discharge of the liquid can be prevented. It can be held more stably.

Further, by forming the pinch-off portion widely at the opposed position, the liquid container itself can be further strengthened, and the reliability against an external impact or the like can be increased.

Further, depending on the thickness of the inner wall, the pinch-off portion may separate from the outer wall 701. In this case, since the pinch-off portion has a length component, the direction of deformation is limited. Therefore, even when the pinch-off portion comes off the outer wall, the deformation is not irregular, and the deformation is performed while maintaining a balance.

Hereinafter, the liquid supply operation of the liquid container configured as above will be described.

The liquid inside the inner wall 702 is
Is supplied to the outside through the liquid supply unit 703
Is supplied to the outside from the liquid in the first storage section 721 close to.

Then, when the liquid in the first storage portion 721 decreases, the inner wall of the first storage portion 721 starts to deform from the most easily deformed portion under the condition of the above-described structure for restricting the deformation. Here, in the present embodiment, the first storage portion 72 of the liquid storage container formed of a polyhedron is used.
At least one of the surfaces having the largest surface area among the substantially planar surfaces of the outer wall is not fixed to the inner wall, so that the deformation starts from a substantially central portion of the inner wall surface corresponding to this surface.

Since this surface has a substantially planar shape, the surface is uniformly and continuously deformed in the direction in contact with the opposing surface in accordance with the amount of decrease in the liquid in the first storage portion 721. Therefore, it is possible to stabilize the negative pressure during liquid supply.

At the same time, the air enters between the inner wall 702 and the outer wall 701 via the gap 707.

Thereafter, when the liquid in the inner wall 702 is further supplied to the outside, the liquid in the second storage part 722 is supplied to the first storage part 721, and the liquid in the second storage part 722 is The liquid is supplied to the outside via the first storage unit and the liquid supply unit 703, and is supplied to the second storage unit
2 also shrinks.

As the derivation of the liquid further proceeds, the inner wall corners of the first storage section 721 and the second storage section 722 begin to separate from the corresponding outer wall corners. Immediately after the corner is detached, by detaching while maintaining the original shape of the corner,
In this configuration, the shape of the corner cannot be maintained as the liquid is led out, and the surface gradually deforms.

Here, regarding the thickness of the inner wall 702, in the manufacturing process, the portion near the center of the surface having the maximum area is thicker than the corner, but in the corner, the inner wall of the three surfaces is thicker. Because they are gathered, the strength is strong.

The first storage section 721 and the second storage section 72
It is desirable that the relationship with 2 is such that the degree of contraction of the first storage portion 721 is constant. The size of the through hole 710 is not particularly limited, but is preferably about 20% of the surface having the maximum area.

In the liquid container configured as described above, the provision of the through hole increases the mechanical strength, and the liquid stored inside is stably supplied to the outside. The periphery of the through hole becomes a pinch-off portion, from which air is introduced between the inner wall and the outer wall, so that more stable liquid supply is performed.

In particular, by providing the through hole, the strength of the maximum area surface can be improved when the maximum amount of liquid that can be stored in the liquid storage portion is contained and the outer surface of the inner wall is almost in contact with the inner surface of the outer wall. In addition to serving as a reinforcing rib, when the liquid is consumed in addition, the inner wall is supported by the outer wall by a pinch-off part even around the through hole, so the liquid storage part against external impact Can be held at a predetermined position.

(Second Embodiment) In the first embodiment described above, the through hole is provided at the center of the surface having the maximum area of the liquid container, but the through hole is provided without providing the through hole. It is also conceivable to constitute by simply pressing the inner walls opposed to each other at an outer wall at the bent portion to form a concave portion.

FIGS. 2A and 2B are views for explaining the operation of the liquid container according to the second embodiment of the present invention. FIG. 2A is a diagram showing a maximum area surface, and FIG. 2B is a diagram showing A in FIG. It is -A 'sectional drawing.

The operation in this embodiment is almost the same as that described in the first embodiment as long as the crimped portion is located at the same position as the pinch-off portion of the through hole. As shown in FIG.
2 is fixed at a crimping portion provided at the center of the liquid storage container, so that the inner wall 702 is stable even when an impact or the like is applied from the outside.

In the present embodiment, the portion where the inner walls are pressed against each other at the center of the liquid storage container is set substantially at the center between the two opposing surfaces having the maximum area, but is parallel to the surface having the maximum area. If so, the present invention is not limited to this, and the inner walls may be crimped together at a portion corresponding to one of the surfaces having the largest area.

(Third Embodiment) FIG. 3 is a view showing a third embodiment of the liquid container according to the present invention.

In this embodiment, as shown in FIG. 3, two through holes 701 are provided in comparison with the first embodiment. In the position where the through hole 701 is provided, the first storage portion 721, the second storage portion 722, and the third storage portion 721 in which the liquid storage portion is separated by the through hole 701.
Assuming that the lengths of the storage portions 723 in the longitudinal direction of the liquid storage container are l1, l2, and l3, respectively, the positions are such that l1>l2> l3 is satisfied.

In the liquid storage container configured as described above, the liquid in the first storage part 721 is consumed, and then the liquid in the second storage part 722 and the liquid in the third storage part 723 are sequentially consumed. Is done.

In the present embodiment, the number of through holes is two. However, the present invention is not limited to this, and it is sufficient if the order in which the liquid inside is consumed can be defined.

(Other Embodiments) The embodiments of the liquid container of the present invention have been described above. Hereinafter, embodiments which can be preferably applied to these embodiments will be described.

First, a method for manufacturing the above-described liquid container will be described in detail.

The liquid container provided by the present invention employs a double-walled structure made of a molded resin material. The outer wall is made thicker to have strength, while the inner wall is made of a soft material and made thinner. This makes it possible to follow the volume fluctuation of the liquid stored inside. As a material used for each wall, it is preferable that the inner wall has liquid resistance and the outer wall has impact resistance and the like.

In this embodiment, blow molding using blowing air was employed as a method for manufacturing a liquid container. This is because the wall constituting the liquid storage container is made of a resin that is not substantially stretched, whereby the inner wall of the liquid storage container forming the liquid storage portion is subjected to a substantially uniform load in any direction. I have to endure. Therefore, even if the liquid stored by the inner wall of the liquid container is swung in any direction in a state where the liquid is consumed to some extent, the inner wall of the liquid container can surely hold the liquid. Improves durability.

Examples of the blow molding method include a method using injection blow, a method using direct blow, and a method using double wall blow.

The production process of the method using the direct blow molding of the present invention will be described in detail by taking the liquid container shown in the second embodiment of the present invention as an example.

FIG. 4 is a view showing a manufacturing process of the liquid container of this embodiment, and FIG. 5 is a flowchart showing a manufacturing procedure of the liquid container.

In FIG. 4, 201 is a main accumulator for supplying the inner wall resin, 202 is a main extruder for extruding the inner wall resin,
203 is a sub-accumulator for supplying the outer wall resin, 204
Is a sub-extruder for extruding the outer wall resin. First, an injection nozzle is used as a multilayer nozzle, and an inner resin and an outer resin are simultaneously injected into a mold to prepare an integrated first and second parison. In this case, the supply of the resin may be such that the inner resin and the outer resin are in contact with each other, not all of them are in contact with each other, or a structure in which a part of the resin contacts. In this case, the surface where the inner resin and the outer resin come into contact can be separated by selecting a material that does not weld the resins, or by adding a compound to one of the resins when supplying to the mold It is necessary to mold it. When the same type of material is required depending on the liquid contact property and the shape with respect to the ink, the resin may be supplied such that the inner material or the outer material has a multilayer structure so that different materials are located on the contact surface. . It is ideal that the supply of the inner resin is uniform over the entire circumference. However, the resin may be partially thinned so as to easily follow the fluctuation of the internal pressure. The method of partially reducing the thickness is selected depending on the internal structure of the ink tank, but the configuration is in accordance with the supply direction of the resin to be supplied into the mold.

The supplied outer wall resin and inner wall resin are supplied to the die 206 via the ring 205 (steps S301 and S302), and the parison 207 in which the first and second parisons are integrated is formed (step S301). Step S303). Next, a mold 208 arranged so as to sandwich the parison 207 integrated with the parison 207 is shown in FIG.
The parison 207 is sandwiched by moving from the state shown in FIG. 4B to the state shown in FIG. 4C (step S30).
4).

At this time, the portion sandwiched between the molds is flattened by the collapse of the circular parison, and is wider than the other portions. This sandwiched portion becomes a pinch-off portion and remains. FIG.
The pictures of the molds shown in (b) to (d) are cross-sectional views at positions crossing the crimped portions. As for the crimping portion provided in the liquid container, the mold of the corresponding portion may be convex, and the parison may be in contact with the opposing portion by the convex portion.

Further, in this embodiment, an example is shown in which the mold is provided with a convex portion from the beginning, but this portion of the mold is slid so that it becomes convex in a step of injecting air, which will be described later. It may be. In the case of a donut shape as in the first embodiment, it is desirable to provide a recess at the center of the convex portion of the mold in order to provide a relief for the resin in the punched portion.

Subsequently, as shown in FIG. 4C, air is injected from the air nozzle 209 and blow-molded into a shape suitable for the mold 208 (step S305). At this time, the inner wall and the outer wall are in close contact with no gap. Further, when the temperature of the mold is adjusted within a range of about ± 30 ° C. with respect to the reference temperature at the time of molding, the variation due to individual differences in the thickness of each wall of the liquid storage container at the time of manufacturing can be reduced. desirable.

Next, the inner and outer walls other than the liquid supply section are peeled off (step S306). As a method of separating the inner wall and the outer wall other than performing the evacuation, there is a method of using materials having different thermal expansion rates (shrinkage rates) for the molding resin forming the inner wall and the outer wall. In this case, after the blow molding, the temperature of the molded product decreases, so that the molded product can be automatically peeled, and the number of steps can be reduced. Similarly, at the time of blow molding, an external force can be applied to a portion where the parison is sandwiched between the molds to separate the inner wall and the outer wall after the molding, and the gap can be communicated with air to be used as an atmosphere communication port. When the storage container is used as an ink storage container for inkjet, it is more preferable because the number of steps can be reduced.

After the inner wall and the outer wall are separated from each other, liquid is injected (step S307). At this time, the liquid container may be made to have substantially the same shape as the initial state by pressurized air before the liquid is injected), and then the liquid may be injected.
Further, when the liquid container is made to have the same shape as the initial state, the liquid may be injected under pressure.

Further, when the amount of the liquid to be injected is about 90% of the volume of the liquid container, it is possible to easily cope with a change in the environment in which the liquid container is placed.
The liquid can be prevented from leaking outside due to changes in external force, temperature, and pressure.

After the liquid has been injected, the liquid container is
The inner wall and the outer wall are in a separable state by drawing out the liquid. Then, after injecting the liquid, the liquid derivation permitting member is attached (step S308).

In the above blow molding, since the parison 207 is processed in a viscous state, neither the inner wall resin nor the outer wall resin has orientation.

Further, assuming that the thicknesses of the inner wall resin and the outer wall resin before the blow molding are t and T, the thicknesses t1 and T after the blow molding are obtained.
1 is processed to be thinner than the thicknesses t and T. The relationship between the thickness of the outer wall resin and the thickness of the inner wall resin is T> from the spirit of the present invention.
t1 and T1> t1. And
The material of the outer wall was made of Noryl resin (registered product of GE), and the resin of the inner wall was formed of polypropylene resin having a lower elastic modulus than the Noryl resin. The thickness of the inner wall employed a method in which the whole was uniformly formed and the whole was contracted by the internal pressure. The use of blow molding not only reduces the number of steps during manufacturing and improves the yield by reducing the number of parts, but also reduces the number of parts and places it at positions corresponding to the corners of the outer wall along the shape of the outer wall of the liquid container. The shape of the inner wall can be made so that the corner of the inner wall comes.

That is, in the initial state in which the liquid is filled, the inner wall has a similar shape to the outer wall of the liquid container, and the inner wall can follow the shape of the outer wall serving as the housing at a predetermined interval. The dead space seen when the bag-shaped container is accommodated in the housing can be eliminated, and the liquid accommodation amount per unit volume in the outer wall of the liquid container can be increased (the liquid accommodation efficiency can be increased). .

Further, by adopting the structure of this embodiment, the inner wall to which the liquid is adhered is separated from the outer wall and is a thin layer, so that it can be easily taken out from the outer wall and separated and discarded or separated and recycled. is there.

The outer wall and the inner wall, which are formed by the direct blow manufacturing method and are separable from each other, have a similar configuration by uniformly inflating a cylindrical parison by air blow with respect to a substantially polygonal column mold. I have. That is, the thickness of the inner wall in the vicinity of the corner is smaller than that in the vicinity of the center of the surface constituting the container. Similarly, the outer wall is formed to be thinner in the vicinity of the corner than in the vicinity of the center of the surface constituting the container.

Next, the molding resin constituting the ink tank of the present invention will be described.

The liquid container according to the present invention has a double structure of an inner wall for storing a liquid and an outer wall covering the inner wall. Therefore, the inner wall is preferably made of a material which is flexible when thinned, has excellent liquid contact properties, and has a low gas permeability, and the outer wall is preferably made of a material which is strong to protect the inner wall. It is.

Therefore, an ink tank having the same shape as that of the first embodiment is made of polypropylene resin as a molding resin,
It was molded using a polyethylene resin and a noril resin. Here, the noril resin is amorphous having almost no crystal structure, and the polypropylene resin and the polyethylene resin have crystallinity.

A non-crystalline resin generally has a small heat shrinkage, and a crystalline resin generally has a large heat shrinkage.

Examples of the amorphous material include polystyrene, polycarbonate, polyvinyl chloride and the like for plastics. In addition, examples of the crystalline material include those that form a crystal part at a certain ratio under a predetermined environment for crystallization, and include polyacetal and polyamide.

The crystalline plastic has a relatively clear melting point such as a glass transition temperature (Tg: a temperature at which a molecule starts micro-Brownian motion and a property changes from a glassy state to a rubbery state). On the other hand, in the case of amorphous plastic, a glass transition temperature is present but no clear melting point is shown.

Since the mechanical strength, specific volume, specific heat, coefficient of thermal expansion, and the like of the plastic change suddenly at the glass transition temperature and melting point, selecting a combination of materials utilizing this property allows the resin on the inner and outer sides to be selected. Can be improved. This example uses an amorphous noril resin on the outer side and a polypropylene resin on the inner side as in the first embodiment described above, and has a mechanical strength on the outer side, In addition, soft materials with large heat shrinkage can be selected.

Further, the polymer molecule has a C—C bond and a C—C bond.
In the case of a hydrocarbon structure consisting only of H bonds, it is called a nonpolar polymer. On the other hand, a polymer containing a large number of polar atoms such as O, S, N, and halogen is called a polar polymer, but the polar polymer has a large intramolecular condensing force and a large bonding force to the resin.

By utilizing this property, nonpolar resins
By combining a non-polar resin and a polar resin, it is possible to improve the releasability of the resin.

As the material used for the liquid container of the present invention, polyethylene resin, polypropylene resin and the like can be applied as described above, but the tensile elastic modulus used as the inner wall is 15 to 3000 (kgf / cm 2). It is desirable that the above conditions are satisfied.

Within these numerical values, the shape, thickness,
A material in a range suitable for the purpose can be selected depending on conditions such as desired negative pressure performance.

In each embodiment of the present invention, the outer wall, the inner wall, and the separation layer described later are described as a single layer. However, in order to enhance the impact resistance, these may be formed as a multilayer structure of different materials. Good. For example, by making the outer wall have a multilayer structure, it is possible to prevent the occurrence of breakage during transportation or installation.

FIG. 6 is a view showing an example in which a separation layer is provided between an inner wall and an outer wall in the liquid container of the present invention.
(A) is a sectional view, and (b) is a bottom view.

As in the first and second embodiments, in order to prevent evaporation of the liquid storage container, equalize the pressure in the container, and prevent leakage of the liquid, the liquid storage container is provided with a plurality of walls and accommodated therein. It is configured to freely follow the internal pressure fluctuation caused by the reduced liquid. In addition, as for the corner α formed by the surface including the liquid supply unit, at least one of the angles formed by the corners α2 of the plurality of opposed inner walls is 90%.
By adopting a configuration of less than or equal to the degree, it is also the same as the first and second embodiments in that it is a deformation restricting portion of the inner wall.

The liquid container 120 shown in FIG.
, 121 is an outer wall of the liquid container, and 122 is
Is the inner wall of the liquid container.

The outer wall 121 and the inner wall 122 are configured so that a part thereof is disposed with the separation layer 129 therebetween, but the other parts are integrated and made of the same material except for the thickness. It is configured. Further, the separation layer 1
Since 29 is made of a material having no adhesiveness to the outer wall 121 and the inner wall 122, the separation between the inner and outer walls and the separation layer is easily realized.

The separation layer 129, the outer wall 121, and the inner wall 122 may be configured to be separable from each other. You may comprise so that it may be arrange | positioned. In any case, only the space between the separation layer 129 and the outer wall 121 communicates with the outside through the air intake port 125 provided in the outer wall 121. The inner wall 122 and the separation layer 129 may be integrated.

Therefore, when the liquid inside the liquid container is consumed, the inner wall 122 is deformed, the volume of the area surrounded by the inner wall is reduced, and the inner wall is forced to return to the initial state by elastic deformation. Works. At this time, since the separation layer is thinner than the inner wall, it is deformed simultaneously with the deformation of the inner wall, and follows the inner wall. Further, the separation layer 127 is supplied from the air intake port 125.
Atmosphere is introduced between and the outer wall. The introduction of this atmosphere
It works to help deform the inner wall and maintain a stable negative pressure when using ink.

Reference numeral 123 denotes a liquid supply section from the inside to the outside of the container, which serves as a connection portion with the liquid introduction section on the member side to which the liquid is supplied. Reference numeral 126 denotes a liquid lead-out permitting member serving as a connection portion with a member to which the liquid is supplied. As in the first embodiment, a pressure contact member, a rubber stopper, a valve structure valve body, and the like are used.

Here, since the outer wall 121 and the inner wall 122 are integral with each other in the vicinity of the liquid supply unit 123, the liquid supply unit 123 is formed in a later-described manufacturing process by blow molding.
Can be easily realized.

Further, since the outer wall and the inner wall are formed integrally near the liquid supply section 123, the strength near the liquid supply section 123 can be increased.

Reference numeral 124 denotes an inner wall welded portion in which the inner wall 122 is engaged with the outer wall 121 with the separation layer 129 interposed therebetween, and supports the inner wall 122 by engaging with the outer wall.

In this embodiment, the thickness of the outer wall is 1 mm,
The thickness of the inner wall is 100 μm, the thickness of the separation layer is 50 μm, the surface area of the inner wall is set to be about 100 cm 2, the outer wall and the inner wall are polypropylene resin, and the separation layer is ethylene vinyl alcohol (hereinafter referred to as EVA). Molded as resin.

Here, the polypropylene resin has a high strength and is hardly permeable to gas, and the EVA resin is hardly permeable to gas as compared with the polypropylene resin, but is poor in liquid contact property.

In the case of the liquid container shown in FIGS. 6A and 6B, the inner wall is not directly in contact with the atmosphere by the separation layer, and the thickness of the outer wall is limited to the inner wall and the separation layer. Since it is sufficiently thicker and the gas permeability is substantially proportional to the average thickness of the wall, it is not necessary to consider the gas permeability of the outer and inner walls. Therefore, the inner wall is required to have good liquid contact with the liquid, the separation layer is required to have low gas permeability, and the outer wall is required to have high strength. Desirable materials can be selected for each of the outer wall, the inner wall, and the separation layer, and the functions are separated.

Here, a method for manufacturing the above-described liquid container will be described.

In the manufacturing method of the liquid container of this embodiment, a blow molding method is used as in the first and second embodiments. As the blow molding method, a method using injection blow, a method using direct blow, There is a method using double wall blow. here,
Regarding the processing method by the direct blow molding method,
The following description focuses on differences from the second embodiment.

FIG. 7 is a diagram showing an ink tank manufacturing process of this embodiment. FIG. 8 is a diagram showing a parison and a mold holding portion intermittently including a separation layer. FIG. 6 is a flowchart showing an ink tank manufacturing procedure.

In FIG. 7, 211 is a main accumulator for supplying the inner wall resin, 212 is a main extruder for extruding the inner wall resin,
213a is a sub-accumulator for supplying the separation layer resin,
14a is a sub-extruder for extruding the separated resin, 213b is a sub-accumulator for supplying the outer wall resin, and 214b is a sub-extruder for extruding the outer wall resin. The inner wall resin, the separation layer resin, and the outer wall resin supplied by these are supplied to the die 216 via the ring 215, and the parison 217 in which these are integrated is formed. The parison 217 is shown in FIG.
As shown in FIG. 7B to FIG. 7D, molding is performed by a mold 218 sandwiching the parison 217 and an air nozzle 219 injecting air from above.

The procedure for manufacturing the liquid container will be described with reference to FIGS.

The inner resin 217c, the separated resin 217b, and the outer resin 217a are supplied (step S31).
The parison 217 is extruded (step S314). Here, as shown in FIG. 8, the supply of the resin is performed by the inner wall resin 217c and the outer wall resin 217c.
a is continuous, and the supply of the separation resin 217b is discontinuously performed.

Next, the mold 218 disposed so as to sandwich the parison 217 is moved from the state shown in FIG. 7B to the state shown in FIG. Is inserted (step S315).

Subsequently, as shown in FIG. 7C, air is injected from the air nozzle 219 to blow-mold into a shape suitable for the mold 218 (step S316). In addition,
The pictures of the molds shown in FIGS. 7B to 7D are cross-sectional views at positions crossing the crimped portions. As for the crimping portion provided in the liquid container, the mold of the corresponding portion is made convex, and the parison is in contact with the opposing portion by this convex portion, and the central portion is punched by the convex portions of the opposing mold. It should just be.

Thereafter, the container is separated from the mold (step S317), and after the ink is injected (step S31).
8) A lid including the liquid lead-out permission member 126 is attached (step S319).

In the above blow molding, since the parison 217 is processed in a viscous state, the inner wall resin, the outer wall resin, and the separation layer resin have no orientation. Further, assuming that the thicknesses of the inner wall resin, the outer wall resin, and the separation resin before blow molding are t, T, and b, the thicknesses t1, T1, and b1 after blow molding are processed to be thinner than the thicknesses t, T, and b. You. The relationship between the thickness of the outer wall resin and the thickness of the inner wall resin is such that T> t and T1> t1 for the purpose of the present invention. Further, since the separation layer is provided only to partially separate the outer wall and the inner wall, there is no limitation on the thickness, but in consideration of the case where the inner wall and the separation layer are not sufficiently separated and separated, compared to the inner wall. Thinner is desirable. Therefore, the thickness b1 of the separation layer is set to b1 = t1 × １ ／.

FIGS. 10A and 10B are views showing an example in which the liquid container according to the present invention has curved corners, wherein FIG. 10A is a sectional view, and FIG.
Is a side view.

This embodiment is different from the above-described liquid storage container in that the corners and the intersections between the surfaces have a minute curved surface shape including a portion forming a central through hole. It is different from the example.

By forming the parison into a small curved surface shape as in this embodiment, when the parison is expanded and formed in a mold,
The corners and the intersections of the surfaces can be formed more thinly but more stably. By forming the corners and intersections as minute curved surfaces, the occurrence of pinholes can be largely prevented.

Looking further at the corners of the minute curved surface, the configuration of this embodiment makes it possible to form the film thickness of the outer wall and the inner wall almost uniformly as compared with the edge-shaped one, and provides a stable surface. Can be moved. Further, by making the film thickness at that portion uniform, it is possible to achieve stable strength.

In addition, by forming a curved surface, the corners and the intersections of the surfaces become spherical (curved) when viewed locally, so that the strength of the portion itself is increased and the region is locally collapsed. It becomes a difficult configuration. As a result, it is possible to more stably achieve the crushing of the surface.

Further, in the case of the present embodiment, (the crushing force of the surface itself) <(the crushing force due to the intersection of the surfaces)
By establishing a relationship such as <(crush control force by corner), the priority of the crash control can be specified, and more stable negative pressure can be generated.

The manufacturing method of the structure of this embodiment can be easily manufactured by forming the portions corresponding to the corners of the mold and the intersections of the surfaces into minute curved surfaces.

Also, in forming the mold, the production of the mold becomes easier and the productivity is improved, so that the production of the liquid container can be provided at a substantially lower cost. Such a configuration is not limited to the shape of the liquid storage container of the present embodiment, and for example, a minute curved surface shape may be adopted only for the remaining corners excluding the center corner.

Next, a case where the liquid storage container according to the embodiment of the present invention shown in FIG. 1 is connected to a recording head will be described.

FIG. 11 is a view showing a recording head which is recording means connectable to the liquid container of the present invention.
Is a schematic perspective view, and (b) is a schematic cross-sectional view in a connection state between the recording head and the liquid container.

In FIG. 11A, reference numeral 401 denotes a recording head unit serving as recording means, and recording heads for black, yellow, cyan, and magenta are integrally formed so that full-color printing can be performed. Assembled. These recording heads have a liquid flow path having an ejection port for ejecting ink, and a heating resistor element for ejecting ink from the ink ejection port.

Reference numeral 402 denotes an ink supply tube as an ink introduction unit for introducing ink into each recording head unit. At an end of the ink supply tube 402, a filter 403 for trapping air bubbles and dust is provided. Is provided.

In the case where the above-described ink tank 100 is mounted on the recording head unit 401, FIG.
As shown in (b), the ink can be supplied by connecting the ink supply pipe 402 to the pressure contact body 106 provided in the ink tank 100. After the ink tank is mounted, the ink inside the ink tank is introduced into the recording head by a recovery unit or the like provided in a recording device (not shown), and an ink communication state is formed. Thereafter, during the printing operation, ink is ejected from the ink ejection unit 404 provided in the recording head, and the ink held in the ink tank inner wall 102 is consumed.

Here, in the liquid container of the present invention, the liquid supply section is provided below the center of the liquid container.
This eliminates the need to adjust the ejection force on the recording head side due to a change in the remaining amount of ink in the liquid storage container.
Further, it is possible to increase the use efficiency of the ink that can be actually used.

Further, the liquid container in each embodiment of the present invention has a negative pressure generating and negative pressure holding capability in the inner package surrounded by the inner wall of the liquid container. The liquid lead-out permission member such as a body, a valve, a rubber stopper, or the like only needs to be able to hold the ink when separated from the recording head.

Finally, a description will be given of an ink jet recording apparatus which carries out recording by mounting the liquid container according to the embodiment of the present invention shown in FIG.

FIG. 12 is a schematic view of an ink jet recording apparatus equipped with a liquid container according to one embodiment of the present invention.

In FIG. 12, the head unit 401 and the liquid container 100 are fixedly supported on the main body of the ink jet recording apparatus by a positioning means (not shown) and are detachably mounted on the carriage.

The forward / reverse rotation of the drive motor 513 is transmitted to the lead screw 504 via the drive transmission gears 511 and 509 to rotate the lead screw 504, and the carriage is rotated by a pin (not shown) engaged with the spiral groove 505 of the lead screw 504. )
Having. Thereby, the carriage is reciprocated in the longitudinal direction of the apparatus.

Reference numeral 502 denotes a cap for capping the front surface of each print head in the print head unit, and is used for performing suction recovery of the print head through an opening in the cap by suction means (not shown). Cap 502 is gear 5
08 and the like, and can move to cover the ejection opening surface of each recording head. Cap 502
A cleaning blade (not shown) is provided in the vicinity of, and this blade is supported movably in the vertical direction in the figure. The blade is not limited to this form, and it goes without saying that a known cleaning blade can be applied to this embodiment.

These capping, cleaning, and suction recovery are configured so that desired operations can be performed at the corresponding positions by the action of the lead screw 505 when the carriage moves to the home position.
If a desired operation is performed at a known timing, any of the embodiments can be applied.

The connection pad 452 of the recording head unit mounted on the carriage is connected to the connection pad 531 when the connection plate 530 provided on the carriage rotates around a predetermined axis, and is electrically connected. . Since no connector is used for this connection, no unnecessary force acts on the recording head.

Although the above embodiments have been described as ink tanks in the field of ink-jet recording, for example, a pen as a recording unit or an ink discharging unit for supplying a liquid to an external member or an external member of a liquid container. Needless to say, the present invention can be applied to a liquid storage container utilizing a negative pressure. In this case, the liquid supply unit corresponding to the ink supply unit of the ink tank may be provided with a liquid outflow prevention member that is an ink lead-out permission member in the ink tank.

The liquid storage container of the present embodiment is applied to an ink jet recording apparatus for storing ink and discharging the ink to perform recording, or a food seasoning such as dressing or various sauces. In addition, a commercial food machine or the like to be supplied to the outside is conceivable, and can store various liquids regardless of viscosity or thermal properties. In this embodiment, the through hole is provided at the center of the surface of the liquid container having the maximum area. However, by providing a plurality of through holes, the above-described effect can be obtained even in a larger liquid container. Can be.

[0157]

Since the present invention is constructed as described above, it has the following effects.

(1) At the center or at a plurality of positions on the surface of the liquid storage container having the maximum area, the liquid storage container is pressure-bonded so that the opposing inner wall is sandwiched between the outer walls. The strength against external impact can be increased, and the inside of the container is divided into a plurality of storage sections, so that a stable negative pressure is generated, whereby a stable supply of liquid can be performed. .

(2) Since a through hole having a pinch-off portion is provided at the center or at a plurality of positions of the surface of the liquid container having the maximum area, even if the container becomes large, the strength against external impact is reduced. Can be enhanced,
In addition, the inside of the container is divided into a plurality of storage portions, and the atmosphere is introduced between the outer wall and the inner wall also from the periphery of the through hole, thereby generating a stable negative pressure, thereby stabilizing the liquid. Supply can be performed.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a liquid container according to the present invention, wherein (a) and (b) are sectional views, (c) is a perspective view,
(D) is a figure which shows the detail of a pinch-off part.

FIGS. 2A and 2B are diagrams for explaining the operation of the liquid container according to the second embodiment of the present invention, wherein FIG. 2A is a diagram showing a maximum area surface, and FIG. 2B is a diagram showing AA ′ shown in FIG. It is sectional drawing.

FIG. 3 is a view showing a third embodiment of the liquid container according to the present invention.

FIG. 4 is a diagram illustrating a manufacturing process of the liquid storage container of the present embodiment.

FIG. 5 is a flowchart showing a procedure for manufacturing a liquid storage container.

FIGS. 6A and 6B are diagrams showing an example in which a separation layer is provided between an inner wall and an outer wall in the liquid container of the present invention, wherein FIG. 6A is a sectional view and FIG. 6B is a bottom view.

FIG. 7 is a diagram illustrating an ink tank manufacturing process of the present embodiment.

FIG. 8 is a view showing a parison including a separating layer intermittently and a holding portion of a mold.

FIG. 9 is a flowchart illustrating an ink tank manufacturing procedure.

FIGS. 10A and 10B are diagrams illustrating an example in which a corner portion of the liquid container according to the present invention is curved, wherein FIG. 10A is a cross-sectional view and FIG.

11A and 11B are diagrams showing a recording head as recording means connectable to the liquid container of the present invention, wherein FIG. 11A is a schematic perspective view, and FIG. 11B is a connection state between the recording head and the liquid container. FIG.

FIG. 12 is a schematic diagram of an ink jet recording apparatus equipped with a liquid container according to one embodiment of the present invention.

[Explanation of symbols]

 100, 110, 120 Liquid container 101, 111, 121, 701 Outer wall 102, 112, 122, 702 Inner wall 103, 113, 123, 703 Liquid supply unit 104, 114a, 114b, 124 Welding unit 105, 125 Air intake 106 , 116, 126 Liquid lead-out permission member 107, 117, 707 Gap 108 Valve 129 Separation layer 201, 211 Main accumulator 202, 212 Main extruder 203, 213 Secondary accumulator 204, 214 Secondary extruder 205, 215 Ring 206, 216 Die 207 , 217 Parison 208, 218 Mold 209, 219 Air nozzle 401 Recording head unit 402 Liquid supply pipe 403 Filter 404 Liquid ejection part 710 Through hole 721 First storage part 722 Second storage part 723 Third storage part 301~S308, S311~S319 step

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-296566 (JP, A) JP-A-5-254143 (JP, A) JP-A 9-267483 (JP, A) JP-A 9-267 58007 (JP, A) JP-A-59-204566 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 2/175

Claims (16)

(57) [Claims] 1. A housing having a substantially polygonal columnar shape provided with an air communication portion , an outer surface having a shape similar to or similar to the inner surface of the housing, and a liquid storage portion for storing a liquid therein is formed. An enclosure that can be peeled off from the housing, a liquid supply unit that supplies liquid from the liquid storage unit to the outside, and a wall that forms the enclosure with walls forming the enclosure.
A liquid container having a pinch-off portion sandwiched and welded between surfaces , wherein the pinch-off portion is formed by two opposing surfaces having a maximum area of the inner package. Liquid storage container. 2. The liquid container according to claim 1, wherein the pinch-off portion is provided substantially at a center of a surface having the maximum area. 3. The liquid container according to claim 1, wherein a plurality of said pinch-off portions are provided. 4. The liquid storage container according to claim 1, wherein the liquid storage portion has a substantially donut shape. 5. The liquid container according to claim 1, wherein the pinch-off portion also serves as an air communication port. 6. The liquid container according to claim 1, wherein an intersection between a corner formed by three extended portions of each of the substantially polygonal columns of the housing and the inner package and a surface intersects with each other. The liquid storage container, wherein the portion and the intersection of the surfaces are minute curved surfaces. 7. A substantially polygonal column-shaped housing provided with an air communication portion , and an outer surface having a shape similar to or similar to the inner surface of the housing, and a liquid storage portion for storing a liquid therein is formed. An enclosure that can be peeled off from the housing, a liquid supply unit that supplies liquid from the liquid storage unit to the outside, and a wall that forms the enclosure with walls forming the enclosure.
What is claimed is: 1. A liquid storage container having a pinch-off portion sandwiched and welded to a surface , wherein the liquid storage container has a through hole in a surface having a maximum area of the housing and the inner package. 8. The liquid container according to claim 7, wherein the through hole is provided at a substantially central portion of a surface having the maximum area. 9. The liquid storage container according to claim 7, wherein a plurality of said pinch-off portions are provided. 10. The liquid container according to claim 7, wherein the liquid container has a substantially donut shape. 11. The liquid container according to claim 7, wherein the pinch-off portion is provided in the through hole. 12. The liquid storage container according to claim 7, wherein the pinch-off portion also serves as an air communication port. 13. The liquid storage container according to claim 7, wherein a corner formed by three extended portions of the substantially polygonal prism of the housing and the inner package intersects with the surface. The liquid storage container, wherein the portion and the intersection of the surfaces are minute curved surfaces. 14. The liquid storage container according to claim 1, wherein the liquid is a food seasoning. 15. The liquid storage container according to claim 1, further comprising: an ink jet head connected to the liquid supply unit and configured to discharge the liquid in response to a recording signal. The ink jet cartridge, wherein the liquid is ink that performs recording by being discharged onto a recording medium. 16. An ink jet recording apparatus comprising: the ink jet cartridge according to claim 15; and a carriage on which the ink jet head cartridge is removably mounted and which is scanned.